Joseph alexander adams



dished we; e.

-forn 1 of type is talteuls still warm in the moldingthcc is obtained.

- air from the surface, is now ready to be immersed in a g in about theproportions named below:

Letters Patent No. 93,806,"!!! 1511 February 15. 1870.

IMPROVE! MODE 0! GQVIiRINC-J- MQLDB ACE.

The Schedule referred bin these Letters Futons and making part a the'sume."

I, Josscn AnnxAxm-m Ansns', of Brooklyn, in the county of Kings, and State of New York, have invented a certain new and useful Process for (loveriug Molds and Various Articles witha'liietallic' Surface, to be used in connection with the process of electrotyping, or otherwise, of which the following is a specification.

in forming elcc-trotype plutes'i'or the printing-press by means of this process, I proceed as i'ollows:

When. the wa's'with which the impression of the pan, the surface is covered with a layer of-finely-powdered tin, whiehis appliedwith a soft brush, nut-ii the whole surface presents a metallic appearance. The superfluous powder is then brushed off the surface, and after the was has become perfectly cold and-solid is polished with a tinesoit brush until a bright sur- The form of type ii'oni which the wax is to receive the impression is firstcoated with powdered tin' or plumbago, to insure the separation of the mould from the type, and an impression of the form is taken in the wax in the usual way.

The mold, after being built up in the customary manner, and the parts so buiit being brushed with tin powder, is then brushed all over with tin powder or a. small quantity. of pluinbago, in order to cover any small breaks that'may have been made in the tinned surface at the time the impression was being taken from the form, and the excess of powder is removed with a bellows. The mold, alter being treated in the usual manner with water and alcohol,- to remove the solution composed of the followingingredients, taken Wat-er, four (4) gallons; sniphate of copper, four (4) pounds; sulphuric acid, one pintthe whole intimately mixed together. r

'.lhe prepared mold is then immersed in the above galvanic battery, when, upon examination, the surface of the mold will be found to have-been almost instantaneouslycovercdwith a thin coatingot' copper. This will bo-cticctcd', indecehcvcn before the connec- ,tion with thebattery has been nnule, as it is'dne to the chemical action alone bctwcen the tin surface: of the mold and tho solut-ionin which it is immersed, and is independent of the galvanic actionol the'battcry. It is simply an'exchange or chemical Sllbsilliill I tion that takes place, by virtue of whi h the oxygcnai in union with the copper seizes upon the tin, for which,

tery also. A coating of silver, nickehorother metal may he also precipitated upon the film of copper fiist'i'ormed, or on that precipitatcd'by the battery, ii"requircd.

By this process of using a metallic powder in connection with the plumbago,'or in place ot'lt, I am enbago alone, would require three or four hours.

Claim. H Iclai'm coating or covering molds or otherarticles as hereinbefore described and specified. J. A. ADAMS.

Witnesses:

0. A. Donors,

solution, and connected with the positive pole of a H EDWARD E; 0313mm.

if'a thick coatingis required, tothe act-ion of the hatsm: omen hunc es was? at it has a greater aflinity,andthe copper is deposited in abled to accomplish in'atew minutes what, with plnmwith a metallic surface, bythc process substanti' y 

